dlls/msvcrt/environ.c

   1 /*
   2  * msvcrt.dll environment functions
   3  *
   4  * Copyright 1996,1998 Marcus Meissner
   5  * Copyright 1996 Jukka Iivonen
   6  * Copyright 1997,2000 Uwe Bonnes
   7  * Copyright 2000 Jon Griffiths
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  22  */
  23 #include "wine/unicode.h"
  24 #include "msvcrt.h"
  25 #include "wine/debug.h"
  26
  27 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
  28
  29 /*********************************************************************
  30  *              getenv (MSVCRT.@)
  31  */
  32 char * CDECL MSVCRT_getenv(const char *name)
  33 {
  34     char **environ;
  35     unsigned int length=strlen(name);
  36
  37     for (environ = *__p__environ(); *environ; environ++)
  38     {
  39         char *str = *environ;
  40         char *pos = strchr(str,'=');
  41         if (pos && ((pos - str) == length) && !strncasecmp(str,name,length))
  42         {
  43             TRACE("(%s): got %s\n", debugstr_a(name), debugstr_a(pos + 1));
  44             return pos + 1;
  45         }
  46     }
  47     return NULL;
  48 }
  49
  50 /*********************************************************************
  51  *              _wgetenv (MSVCRT.@)
  52  */
  53 MSVCRT_wchar_t * CDECL _wgetenv(const MSVCRT_wchar_t *name)
  54 {
  55     MSVCRT_wchar_t **environ;
  56     unsigned int length=strlenW(name);
  57
  58     for (environ = *__p__wenviron(); *environ; environ++)
  59     {
  60         MSVCRT_wchar_t *str = *environ;
  61         MSVCRT_wchar_t *pos = strchrW(str,'=');
  62         if (pos && ((pos - str) == length) && !strncmpiW(str,name,length))
  63         {
  64             TRACE("(%s): got %s\n", debugstr_w(name), debugstr_w(pos + 1));
  65             return pos + 1;
  66         }
  67     }
  68     return NULL;
  69 }
  70
  71 /*********************************************************************
  72  *              _putenv (MSVCRT.@)
  73  */
  74 int CDECL _putenv(const char *str)
  75 {
  76  char *name, *value;
  77  char *dst;
  78  int ret;
  79
  80  TRACE("%s\n", debugstr_a(str));
  81
  82  if (!str)
  83    return -1;
  84
  85  name = HeapAlloc(GetProcessHeap(), 0, strlen(str) + 1);
  86  if (!name)
  87    return -1;
  88  dst = name;
  89  while (*str && *str != '=')
  90   *dst++ = *str++;
  91  if (!*str++)
  92  {
  93    ret = -1;
  94    goto finish;
  95  }
  96  *dst++ = '\0';
  97  value = dst;
  98  while (*str)
  99   *dst++ = *str++;
 100  *dst = '\0';
 101
 102  ret = SetEnvironmentVariableA(name, value[0] ? value : NULL) ? 0 : -1;
 103
 104  /* _putenv returns success on deletion of nonexistent variable, unlike [Rtl]SetEnvironmentVariable */
 105  if ((ret == -1) && (GetLastError() == ERROR_ENVVAR_NOT_FOUND)) ret = 0;
 106
 107  /* Update the __p__environ array only when already initialized */
 108  if (_environ)
 109    _environ = msvcrt_SnapshotOfEnvironmentA(_environ);
 110  if (_wenviron)
 111    _wenviron = msvcrt_SnapshotOfEnvironmentW(_wenviron);
 112
 113 finish:
 114  HeapFree(GetProcessHeap(), 0, name);
 115  return ret;
 116 }
 117
 118 /*********************************************************************
 119  *              _wputenv (MSVCRT.@)
 120  */
 121 int CDECL _wputenv(const MSVCRT_wchar_t *str)
 122 {
 123  MSVCRT_wchar_t *name, *value;
 124  MSVCRT_wchar_t *dst;
 125  int ret;
 126
 127  TRACE("%s\n", debugstr_w(str));
 128
 129  if (!str)
 130    return -1;
 131  name = HeapAlloc(GetProcessHeap(), 0, (strlenW(str) + 1) * sizeof(MSVCRT_wchar_t));
 132  if (!name)
 133    return -1;
 134  dst = name;
 135  while (*str && *str != '=')
 136   *dst++ = *str++;
 137  if (!*str++)
 138  {
 139    ret = -1;
 140    goto finish;
 141  }
 142  *dst++ = 0;
 143  value = dst;
 144  while (*str)
 145   *dst++ = *str++;
 146  *dst = 0;
 147
 148  ret = SetEnvironmentVariableW(name, value[0] ? value : NULL) ? 0 : -1;
 149
 150  /* _putenv returns success on deletion of nonexistent variable, unlike [Rtl]SetEnvironmentVariable */
 151  if ((ret == -1) && (GetLastError() == ERROR_ENVVAR_NOT_FOUND)) ret = 0;
 152
 153  /* Update the __p__environ array only when already initialized */
 154  if (_environ)
 155    _environ = msvcrt_SnapshotOfEnvironmentA(_environ);
 156  if (_wenviron)
 157    _wenviron = msvcrt_SnapshotOfEnvironmentW(_wenviron);
 158
 159 finish:
 160  HeapFree(GetProcessHeap(), 0, name);
 161  return ret;
 162 }